The Curtiss Hawk II
represented the end of a lengthy period of a Boeing monopoly on single seat
fighter sales to the US Navy. This is not to say that Curtiss products or those
of other manufacturers were unsatisfactory or that Boeing had an unethical
relationship with US Navy procurement officers since Curtiss had sold a number
of two-seaters to the Navy during this period.

Major operators included Bolivia(9), China
(50), Colombia (26), Siam (12) and Turkey (24). Except for the Turkish machines
all of these Hawks saw intensive combat service. Additionally Hawk II fighters
were sold in ones, two's and threes to various small scale operators including
the famous two Hawks that were sold to WW1 ace Ernst Udet.